Groundwater in New York County contains manganese, iron, chloride, and sulfate. Several of these contaminants exceed EPA health standards, making them a concern for well owners in this area.
The rock beneath New York County naturally contains iron and manganese, which dissolve into groundwater as it moves through the ground. Chloride and sulfate enter from road salt, de-icing chemicals, and urban sources that seep down into the water supply. The dense development and infrastructure of Manhattan accelerate these contaminants reaching groundwater faster than in less urban areas.
Groundwater in New York County is characterized by elevated iron, sodium, and chloride. These minerals come from both the natural rock composition and the urban environment above it. Iron and sodium are common findings across wells in this county.
Wells in New York County commonly have chloride, iron, manganese, and sulfate at levels exceeding EPA health standards. Chloride and sulfate at elevated concentrations can affect kidney function and digestion over time. Iron and manganese in drinking water can cause problems with the nervous system and organ function with long-term exposure. Because multiple contaminants exceed standards in this county, testing your well is important.
Iron stains clothes, dishes, and fixtures with orange or brown marks. High sodium in county well water adds a salty taste that many people notice right away. The combination of these minerals can shorten the lifespan of water heaters and dishwashers. You may also see cloudiness or discoloration when water sits in a glass.
We recommend a comprehensive metals and minerals panel to find out what is actually in your well, since every well is different and yours may have higher or lower levels than what is common here. Testing is the only way to know exactly what you are drinking so you can treat it properly. A comprehensive panel typically costs between two hundred and four hundred dollars. Treatment options like reverse osmosis systems or ion exchange softening can address multiple contaminants at once.
Not sure if your well is affected? Get certified results in 5–7 days.
Test Your Well Water with Tap Score →| Contaminant | Samples ⓘ | % Above MCL ⓘ | Distribution ⓘ | Confidence ⓘ | Risk ⓘ |
|---|---|---|---|---|---|
| Manganese | 33 | 85% | Moderate | High | |
| Iron | 33 | 79% | Moderate | High | |
| Chloride | 34 | 59% | Moderate | High | |
| Sulfate | 34 | 18% | Moderate | High | |
| Nitrate | 34 | 3% | Moderate | Low | |
| Arsenic | 34 | 0% | Moderate | Low | |
| Fluoride | 34 | 0% | Moderate | Low | |
| HFPO-DA (GenX) ⓘ municipal | 16 | 0% | Moderate | Safe | |
| Lead | 33 | 0% | Moderate | Low | |
| Nitrite | 33 | 0% | Moderate | Low | |
| PFHxS ⓘ municipal | 16 | 0% | Moderate | Safe | |
| PFNA ⓘ municipal | 16 | 0% | Moderate | Safe | |
| PFOA ⓘ municipal | 16 | 0% | Moderate | Safe | |
| PFOS ⓘ municipal | 16 | 0% | Moderate | Safe | |
| Hardness | 1 | — | Low | Low ⓘ | |
| PFBS ⓘ municipal | 16 | — | Moderate | Safe | |
| pH | 34 | — | Moderate | Low | |
| Sodium | 34 | — | Moderate | Low |
MCL = Maximum Contaminant Level (EPA limit for public water; used as benchmark for private wells). Distribution shows % of sampled wells in each concentration band. Methodology.
* Microbial contaminants (E. coli, coliform) reflect only samples from the last 10 years.
Data shows potential risk — a certified test confirms whether your water is affected.
Order a Tap Score Test →Population-level CDC data. Not individual risk prediction.
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